Multiple-Support Excitation

Structural systems typically have different ground accelerations at supports separated by long distances. These systems can be a single structure such as a long span bridge or multiple structures in a region. While most OpenSees analyses use uniform excitation with effective earthquake forces applied to the dynamic DOFs of the model, the framework also accommodates … Continue reading Multiple-Support Excitation

Making Sense Out of Concrete02

Those three extra parameters for Concrete02 are usually enough to make me stick with Concrete01. I struggle to come up with good values for the parameters $latex \lambda$, $latex f_t$, and $latex E_{ts}$ shown in the following image from the OpenSees Concrete02 wiki page. Image developed by Dr. Silvia Mazzoni The four compressive backbone parameters … Continue reading Making Sense Out of Concrete02

Parameter Updates in the Loop

Besides visualization and writing output to files, there's some pretty useful things you can do during an OpenSees analysis. One of those things is updating model parameters. Before getting into parameter updating, it is worth showing that OpenSees analyses can be run one step at a time. Many examples online show a dynamic analysis, e.g., … Continue reading Parameter Updates in the Loop

Nobody Wants to Read Your Sh!t

Although far removed from earthquake engineering and academic writing, we can learn a lot from writers of advertising and fiction. The most important lesson I've learned is that nobody wants to read your shit. Steven Pressfield wrote an entire book about it, but I'm pretty sure the phrase was around long before the book. reading Nobody Wants to Read Your Sh!t

Building Blocks

I gave a presentation last week for the 6th International Short Course on Seismic Analysis of Structures, hosted remotely and on-site at the University of Palermo, Italy, organized by Prof. Giovanni Minafo and Prof. Cristoforo Demartino. As you can see in the video, my presentation re-packaged leveraged several blog posts. Not every slide was … Continue reading Building Blocks